Thirty eight soil samples collected from nine profiles representing the major soil groups viz.. red black, laterite and alluvial soils were examined for organic P content. The organic P content of the soils ranged from 26 to 467 ppm and its percentage to total P was from 9.11 to 56.81. Highest organic P was recorded in the high level faterie soils. Organic P was rich. in the surface layers and it was found to decrease with depth in most of the profiles. The range of organic C/org. P ratio was from 5.05 to 123.4. Organic P significantly correlated with total P. organic carbon, total N and C/N ratio. Org. C/Org. P significantly correlated with C/N ratio.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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